JPS57124243A - Detection for surface flaw of steel material - Google Patents
Detection for surface flaw of steel materialInfo
- Publication number
- JPS57124243A JPS57124243A JP1003781A JP1003781A JPS57124243A JP S57124243 A JPS57124243 A JP S57124243A JP 1003781 A JP1003781 A JP 1003781A JP 1003781 A JP1003781 A JP 1003781A JP S57124243 A JPS57124243 A JP S57124243A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- flaws
- cracking
- irradiation angle
- transverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
PURPOSE:To permit simultaneous detection of longitudinal cracking flaws and transverse cracking flaws simultaneously by setting the directions and angles of irradiation of irradiating light to the surface of a steel material at prescribed values. CONSTITUTION:Illuminators 5, 5 irradiate light which is nearly belt-like parallel light to an area on the surface of a slab S corresponding to the visual field of a solid state image sensing element 14 of an image pickup device 6. The irradiation direction alpha and irradiation angle beta of the irraidating rays are set at the values calculated in accordance with the equations on the basis of an optimum irradiation angle theta1 for detection of longitudinal cracking flaws and an optimum irradiation angle theta2 for detection of transverse cracking flaws. The luminance patterns reflected from the slab S obtained from the device 6 are displayed in a monitor television 22 via an image converter 21, and are inputted to a longitudinal cracking flaw detector 23 and a transverse cracking flaw detector 24.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1003781A JPS57124243A (en) | 1981-01-26 | 1981-01-26 | Detection for surface flaw of steel material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1003781A JPS57124243A (en) | 1981-01-26 | 1981-01-26 | Detection for surface flaw of steel material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57124243A true JPS57124243A (en) | 1982-08-03 |
Family
ID=11739189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1003781A Pending JPS57124243A (en) | 1981-01-26 | 1981-01-26 | Detection for surface flaw of steel material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57124243A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63255647A (en) * | 1987-03-30 | 1988-10-21 | アルミナム カンパニ− オブ アメリカ | Method of inspecting moving metallic surface |
JP2004309287A (en) * | 2003-04-07 | 2004-11-04 | Nippon Sheet Glass Co Ltd | Defect detection device and defect detection method |
JP2006329919A (en) * | 2005-05-30 | 2006-12-07 | Sumitomo Metal Mining Co Ltd | Lighting apparatus and image processing apparatus and method using the same |
-
1981
- 1981-01-26 JP JP1003781A patent/JPS57124243A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63255647A (en) * | 1987-03-30 | 1988-10-21 | アルミナム カンパニ− オブ アメリカ | Method of inspecting moving metallic surface |
JP2004309287A (en) * | 2003-04-07 | 2004-11-04 | Nippon Sheet Glass Co Ltd | Defect detection device and defect detection method |
JP2006329919A (en) * | 2005-05-30 | 2006-12-07 | Sumitomo Metal Mining Co Ltd | Lighting apparatus and image processing apparatus and method using the same |
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